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Enhanced photocatalytic activity for degradation of methyl orange over silica-titania

Authors:

Weifeng ZhangAuthors Info & Claims

Journal of Nanomaterials, Volume 2011

Article No.: 9, Page 9

https://doi.org/10.1155/2011/296953

Published: 01 January 2011 Publication History

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Abstract

Silica-modified titania (SMT) powders with different atomic ratios of silica to titanium (Rx) were successfully synthesized by a simple ultrasonic irradiation technique. The prepared samples were characterized by X-ray diffraction (XRD), FT-IR spectroscopy, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and ultraviolet visible spectroscopy. The specific surface area was measured according to BET theory. Results indicate that the addition of silica to titania can suppress the crystalline size growth and the transformation of anatase phase to rutile phase of titania, enlarge specific surface area of the titania particles, and result in a blue shift of absorption edge compared to pure titania. The photocatalytic activity of the SMT samples was evaluated by decolorizing methyl orange aqueous solutions under UV-visible light irradiation. It was found in our study that this activity was affected by silica content, calcination temperature, H₂SO₄, and oxidants such as KIO₄, (NH₄)₂S₂O₈ and H₂O₂. The results reveal that the photocatalytic activity of 0.1-SMT catalyst is the best among all samples calcined at 550°C for 1 h and it is 1.56 times higher than that of Degussa P-25 titania, which is a widely used commercial TiO₂ made by Germany Degussa company and has been most widely used in industry as photocatalyst, antiultraviolet product, and thermal stabilizer. The optimal calcination temperature for preparation was 550°C. The photocatalytic activity of SMT samples is significantly enhanced by H₂SO₄ solution treatment and oxidants.

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Cited By

Ojemaye MOkoh OOkoh A(2017)Performance of NiFe2O4-SiO2-TiO2 Magnetic Photocatalyst for the Effective Photocatalytic Reduction of Cr(VI) in Aqueous SolutionsJournal of Nanomaterials10.1155/2017/52649102017(13)Online publication date: 1-Jan-2017
https://dl.acm.org/doi/10.1155/2017/5264910
Luo ZWei CHe NSun ZLi HChen D(2015)Correlation between the photocatalytic degradability of PAHs over Pt/TiO2-SiO2 in water and their quantitative molecular structureJournal of Nanomaterials10.1155/2015/2848342015(6-6)Online publication date: 1-Jan-2015
https://dl.acm.org/doi/10.1155/2015/284834
Ye MYang YZhang YZhang TShao W(2012)Hydrothermal synthesis of hydrangea-like F-doped titania microspheres for the photocatalytic degradation of carbamazepine under UV and visible light irradiationJournal of Nanomaterials10.1155/2012/5834172012(8-8)Online publication date: 1-Jan-2012
https://dl.acm.org/doi/10.1155/2012/583417

Index Terms

Enhanced photocatalytic activity for degradation of methyl orange over silica-titania
1. Applied computing
  1. Physical sciences and engineering
    1. Chemistry
    2. Physics

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Published In

cover image Journal of Nanomaterials

Journal of Nanomaterials Volume 2011, Issue

Special issue on nanotechnology for tissue engineering applications

January 2011

83 pages

ISSN:1687-4110

EISSN:1687-4129

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Hindawi Limited

London, United Kingdom

Publication History

Accepted: 02 March 2011

Published: 01 January 2011

Received: 01 November 2010

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Cited By

Ojemaye MOkoh OOkoh A(2017)Performance of NiFe2O4-SiO2-TiO2 Magnetic Photocatalyst for the Effective Photocatalytic Reduction of Cr(VI) in Aqueous SolutionsJournal of Nanomaterials10.1155/2017/52649102017(13)Online publication date: 1-Jan-2017
https://dl.acm.org/doi/10.1155/2017/5264910
Luo ZWei CHe NSun ZLi HChen D(2015)Correlation between the photocatalytic degradability of PAHs over Pt/TiO2-SiO2 in water and their quantitative molecular structureJournal of Nanomaterials10.1155/2015/2848342015(6-6)Online publication date: 1-Jan-2015
https://dl.acm.org/doi/10.1155/2015/284834
Ye MYang YZhang YZhang TShao W(2012)Hydrothermal synthesis of hydrangea-like F-doped titania microspheres for the photocatalytic degradation of carbamazepine under UV and visible light irradiationJournal of Nanomaterials10.1155/2012/5834172012(8-8)Online publication date: 1-Jan-2012
https://dl.acm.org/doi/10.1155/2012/583417

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